I did gsr swap in my 93 EG and wanted to know where the two wires on the iac hooks up to? I did a test on the red wire and got 0.29 volts and 12 volts from the yell/blk wire.according to the ecu pinout, one of the wires should go to the ECU in A9. Ijust wanted to know ifthe wire goes straight to the ECU or does it to a fuse first.I tried to trace the wire from A9 but cant find where it goes, then i realized that the yellblk from the iac changes colour at the firewall to red/black but it goes to A6, but A6 shoud be an O2 wire. here is the pinout. .:FFS TechNet : OBD1 ECU Pin out Schematics :.